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  • 1.
    Coppel, L.G.
    et al.
    RISE., Innventia.
    Andersson, M.
    Edström, P.
    Determination of quantum efficiency in fluorescing turbid media2011Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, nr 17, s. 2784-2792Artikel i tidskrift (Refereegranskat)
  • 2.
    Feng, Xingxing
    et al.
    Zhejiang University, China.
    Ye, Kangpeng
    Zhejiang University, China.
    Lou, Chaoteng
    Zhejiang University, Hangzhou, China.
    Suo, Xingmeng
    Zhejiang University, China.
    Song, Yujie
    Zhejiang University, China.
    Pang, Xiaodan
    KTH Royal Institute of Technology, Sweden.
    Ozolins, Oskars
    RISE Research Institutes of Sweden, Digitala system, Industriella system. KTH Royal Institute of Technology, Sweden.
    Zhang, Lu
    Zhejiang University, China; Zhejiang Lab, China.
    Yu, Xianbin
    Zhejiang University, China; Zhejiang Lab, China.
    Human recognition with the optoelectronic reservoir-computing-based micro-Doppler radar signal processing2022Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 61, nr 19, s. 5782-5789Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Current perception and monitoring systems, such as human recognition, are affected by several environmental factors, such as limited light intensity, weather changes, occlusion of targets, and public privacy. Human recognition using radar signals is a promising direction to overcome these defects; however, the low signal-to-noise ratio of radar signals still makes this task challenging. Therefore, it is necessary to use suitable tools that can efficiently deal with radar signals to identify targets. Reservoir computing (RC) is an efficient machine learning scheme that is easy to train and demonstrates excellent performance in processing complex time-series signals. The RC hardware implementation structure based on nonlinear nodes and delay feedback loops endows it with the potential for real-time fast signal processing. In this paper, we numerically study the performance of the optoelectronic RC composed of optical and electrical components in the task of human recognition with noisy micro-Doppler radar signals. A single-loop optoelectronic RC is employed to verify the application of RC in this field, and a parallel dual-loop optoelectronic RC scheme with a dual-polarization Mach–Zehnder modulator (DPol-MZM) is also used for performance comparison. The result is verified to be comparable with other machine learning tools, which demonstrates the ability of the optoelectronic RC in capturing gait information and dealing with noisy radar signals; it also indicates that optoelectronic RC is a powerful tool in the field of human target recognition based on micro-Doppler radar signals. 

  • 3. Franco, C S
    et al.
    Quintero, G A
    Myren, N
    Kudlinski, A
    Zeghlache, H
    Carvalho, H R
    Triques, A L C
    Gonzales, D M
    Gouvêa, P M P
    Martinelli, G
    Quiquempois, Y
    Lesche, B
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Carvalho, I C S
    Measurement of Depletion Region Width in Poled Silica2005Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 42, nr 27, s. 5793-96Artikel i tidskrift (Refereegranskat)
  • 4. Junique, S
    et al.
    Wang, Q
    RISE., Swedish ICT, Acreo.
    Almqvist, S
    Guo, J
    Martijn, H
    Noharet, B
    Andersson, JY
    RISE., Swedish ICT, Viktoria.
    GaAs-based multiple-quantum-well spatial light modulators fabricated by a wafer-scale process2005Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 44, nr 9, s. 1635-41Artikel i tidskrift (Refereegranskat)
  • 5. Karlsson, G
    et al.
    Myren, N
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Taccheo, S
    Laurell, F
    High power widely tunable fiber coupled Er:Yb glass laser2003Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 42, s. 4327-Artikel i tidskrift (Refereegranskat)
  • 6.
    Margulis, W
    et al.
    RISE., Swedish ICT, Acreo.
    Yu, Z
    RISE., Swedish ICT, Acreo.
    Malmström, M
    Rugeland, P
    Knape, H
    Tarasenko, O
    RISE., Swedish ICT, Acreo.
    High-speed electrical switching in optical fibers (INVITED)2011Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 50, nr 25, s. e65-75Artikel i tidskrift (Refereegranskat)
  • 7. Neuman, M.
    et al.
    Coppel, L.G.
    RISE., Innventia.
    Edström, P.
    Angle resolved color of bulk scattering media2011Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, nr 36, s. 6555-6563Artikel i tidskrift (Refereegranskat)
  • 8.
    Petermann, Ingemar
    et al.
    RISE., Swedish ICT, Acreo.
    Sahlgren, B
    Helmfrid, S
    Friberg, A T
    Fonjallaz, P-Y
    Fabrication of advanced fiber Bragg gratings by use of sequential writing with a continuous-wave ultraviolet laser source2002Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 41, nr 6, s. 1051-Artikel i tidskrift (Refereegranskat)
  • 9. Rugeland, P
    et al.
    Margulis, W
    RISE., Swedish ICT, Acreo.
    Revisiting twin-core fiber sensors for high-temperature measurements2012Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 51, nr 25, s. 6227-32Artikel i tidskrift (Refereegranskat)
  • 10.
    Rydefalk, Staffan
    RISE., STFI-Packforsk.
    Applications of the theory of fluctuation in the regular transmittance through a dispersion of large cylindrical particles to concentration and size measurements2008Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 47, nr 25, s. 4509-4521Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Four measurement principles based on the theory of fluctuation in the regular transmittance through a dispersion of large cylindrical particles are presented. The principles concern the measurement of particle concentration, particle length classes, particle length, and particle width. In previous publications, the measurement principles were briefly presented. A more complete description, experimental demon strations, and a number of considerations needed to understand the region of validity of the different principles, as well as their uncertainty, are presented. A recently published simulation model [Appl. Opt. 47, 993 (2008)] is used. The basic ideas of the measurement principles within their respective regions of validity are supported.

  • 11.
    Rydefalk, Staffan
    RISE., STFI-Packforsk.
    Assessment of the mean and variance of the random regular transmittance through a dispersion of large cylinders using numerical simulations2008Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 47, nr 7, s. 993-1001Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In two previous papers [J. Opt. Soc. Am. A15, 1698 (1998); J. Opt. Soc. Am. A16, 2737 (1999)] the theory of fluctuations in the regular transmittance T through a flowing dispersion of large slender cylindrical particles was presented. The theory covers, among other things, expressions for the expected value ÎŒ<inf>T</inf> and the variance σ<inf>T</inf>2 of T in the two extreme cases when the cylinders are much shorter or much longer than the diameter of the optical beam used. Intermediate lengths were not treated. Numerical simulation is used to demonstrate the random behavior of T for intermediate cylinder lengths. The simulation results are consistent with the theory and provide a reliable estimate of the measurements produced by this analysis process. The result of the simulation is summarized as a fitted Bézier function model. The advantage of the simulation lies primarily in estimating measurement errors caused by the presence of intermediate length particles in measurement applications.

  • 12. Sjöberg, H
    et al.
     Noharet, B 
    RISE., Swedish ICT, Acreo.
    Distortion-invariant filter for nonoverlapping noise1999Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 37, nr 29, s. 6922-Artikel i tidskrift (Refereegranskat)
  • 13.
    Strothkämper, Christian
    et al.
    Physikalisch-Technische Bundesanstalt, Germany.
    Ferrero, A
    CSIC Agencia Estatal, Spain.
    Koo, A
    MSL Measurement Standards Laboratory of NZ, New Zealand.
    Jaanson, P
    VTT Technical Research Centre of Finland Ltd, Finland.
    Ged, G
    Conservatoire National des Arts et Métiers, France.
    Obein, G
    Conservatoire National des Arts et Métiers, France.
    Källberg, Stefan
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Audenaert, J
    KU Leuven, Belgium.
    Lelaut, FB
    KU Leuven, Belgium.
    Martínez-Verdú, FM
    University of Alicante, Spain.
    Perales, E
    University of Alicante, Spain.
    Schirmacher, A
    Physikalisch-Technische Bundesanstalt, Germany.
    Campos, J
    CSIC Agencia Estatal, Spain.
    Multilateral spectral radiance factor scalecomparison2017Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 56, nr 7, s. 1996-2006, artikel-id 279674Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The field of spectral radiance factor (SRF) measurements has seen growing interest in recent years. Scale conformity has so far only been established between the national metrology institutes (NMIs) of Germany and the USA. This study aims at a bigger, multilateral scale comparison. For this purpose, a total of six NMIs participated in a scale comparison of goniospectrophotometers based on neutral and colored diffusely reflecting ceramics samples. In addition, two universities, providing a home-built gonioreflectometer and two widely used commercially available color measurement instruments, respectively, were involved. The wavelength range of the scale comparison covers the visible wavelength range from 380 nm to 780 nm. Results indicate systematic issues and that the uncertainty evaluation of the NMIs requires further work; although for the greatest part of the covered spectral range the agreement is good.

  • 14.
    Tran, Duc Minh
    et al.
    DTU Technical University of Denmark, Sweden.
    Jensen, Mark Bo
    DTU Technical University of Denmark, Sweden.
    Santafé-Gabarda, Pablo
    Spanish National Research Council, Spain.
    Källberg, Stefan
    RISE Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Ferrero, Alejandro
    Spanish National Research Council, Spain.
    Hannemose, Morten Rieger
    DTU Technical University of Denmark, Sweden.
    Frisvad, Jeppe Revall
    DTU Technical University of Denmark, Sweden.
    Digitizing translucent object appearance by validating computed optical properties2024Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 63, nr 16, s. 4317-4331Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The optical properties available for an object are most often fragmented and insufficient for photorealistic rendering of the object. We propose a procedure for digitizing a translucent object with sufficient information for predictive rendering of its appearance. Based on object material descriptions, we compute optical properties and validate or adjust this object appearance model based on comparison of simulation with spectrophotometric measurements of the bidirectional scattering-surface reflectance distribution function (BSSRDF). To ease this type of comparison, we provide an efficient simulation tool that computes the BSSRDF for a particular light-view configuration. Even with just a few configurations, the localized lighting in BSSRDF measurements is useful for assessing the appropriateness of computed or otherwise acquired optical properties. To validate an object appearance model in a more common lighting environment, we render the appearance of the obtained digital twin and assess the photorealism of our renderings through pixel-by-pixel comparison with photographs of the physical object. 

  • 15.
    Yang, Li
    et al.
    RISE - Research Institutes of Sweden, Bioekonomi, Papperstillverkning och förpackningar.
    Karlsson, Max
    Uppsala University, Sweden.
    Effective method for fast and detailed analysis of holographic patterns over a large area2017Ingår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 56, nr 26, s. 7491-7497Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An effective method is proposed that enables one to simultaneously analyze details of numerous holographic grating patterns over a large area. Unlike the conventional approaches relying on sophisticated lighting and optical systems and dark environment, only a flatbed scanner is needed. Thanks to the “rotate-scan” measurement strategy, details of the holographic grating patterns can be obtained, e.g., spatial distribution of the grating patterns, interval and orientation of the grating grooves within each grating pattern, and defects of the holographic patterns. The method has been verified by applications to two holographic papers of different grating intervals and orientations. The measured values agree well with those obtained with a light optical microscope (LOM). The proposed method is applicable to both transparent and reflective holographic materials of broad grating periodicity.

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